CVE-2026-74728None▾ Sunlit

In the Linux kernel, the following vulnerability has been resolved: xfs: handle NULL b_addr in xfs_buf_free When xfs_buf_alloc_backing_mem() fails, xfs_buf_free() is called with bp->b_addr still NULL

In the Linux kernel, the following vulnerability has been resolved: xfs: handle NULL b_addr in xfs_buf_free When xfs_buf_alloc_backing_mem() fails, xfs_buf_free() is called with bp->b_addr still NULL. The code falls through to the fol…

▾ Sunlit zone — Low / medium · no exploitation signal

Depth score3/ 100 · Minimal

impact 2.8 · likelihood 0 · exploitation 0

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Proof of concept

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Published

Aug 22, 2026

Updated

Oct 14, 2026

CVSS

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Vendor

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Product

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CWE

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Depth score

3 · Minimal

EPSS

0.21% · p10

Platforms

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Source

NVD

Vector

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Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

3 events · 53 days

Aug 22, 2026Published
Disclosed via NVD
Oct 14, 2026Record revised
Last analysed / modified upstream
Oct 14, 2026EPSS first tracked
0.2%

#nvd

Full technical detail▾

Overview

In the Linux kernel, the following vulnerability has been resolved:

xfs: handle NULL b_addr in xfs_buf_free

When xfs_buf_alloc_backing_mem() fails, xfs_buf_free() is called with bp->b_addr still NULL. The code falls through to the folio_put path which calls virt_to_folio(NULL), dereferencing an invalid address and causing a kernel crash.

Call Trace: xfs_buf_free+0x25f/0x510 xfs_buf_alloc+0xc98/0x19b0 xfs_buf_find_insert+0x55/0x14d0 xfs_buf_get_map+0x122b/0x17c0 xfbtree_init_leaf_block+0x11c/0x4a0 xfbtree_init+0x1bb/0x460 xrep_rmap_setup_scan+0x100/0x1f0 xrep_rmapbt+0x41/0xc0

Fix this by skipping folio_put() when bp->b_addr is NULL.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References